渐变色极坐标echarts 折线配置项内容和展示

      var data = [
    [5000, 10000, 6785.71],
    [4000, 10000, 6825],
    [3000, 6500, 4463.33],
    [2500, 5600, 3793.83],
    [2000, 4000, 3060],
    [2000, 4000, 3222.33],
    [2500, 4000, 3133.33],
    [1800, 4000, 3100],
    [2000, 3500, 2750],
    [2000, 3000, 2500],
    [1800, 3000, 2433.33],
    [2000, 2700, 2375],
    [1500, 2800, 2150],
    [1500, 2300, 2100],
    [1600, 3500, 2057.14],
    [1500, 2600, 2037.5],
    [1500, 2417.54, 1905.85],
    [1500, 2000, 1775],
    [1500, 1800, 1650]
];
var cities = ['北京', '上海', '深圳', '广州', '苏州', '杭州', '南京', '福州', '青岛', '济南', '长春', '大连', '温州', '郑州', '武汉', '成都', '东莞', '沈阳', '烟台'];
var barHeight = 50;
console.log(echarts)
option = {
    title: {
        text: '在中国租个房子有多贵？',
        subtext: '市中心一室月租费（数据来源：https://www.numbeo.com）'
    },
    legend: {
        show: true,
        data: ['价格范围', '均值']
    },
    grid: {
        show: true,
        // backgroundColor:"green"
    },
    angleAxis: {
        type: 'category',
        data: cities
    },
    tooltip: {
        show: true,
        formatter: function(params) {
            var id = params.dataIndex;
            return cities[id] + '<br>最低：' + data[id][0] + '<br>最高：' + data[id][1] + '<br>平均：' + data[id][2];
        }
    },
    radiusAxis: {},
    polar: {},
    series: [{
        type: 'line',
        itemStyle: {
            color: 'transparent'
        },
        data: [...data.map(e=>{
            return data[0][1]
        }),data[0][1]],
        coordinateSystem: 'polar',
        smooth:true,
        areaStyle: {
            normal: {
                color: new echarts.graphic.RadialGradient(0.5, 0.5, 1, [{
                    offset: 0.1,
                    color: 'rgba(255, 0, 0, 0.5)'
                }, {
                    offset: 1,
                    color: 'rgba(255, 255, 0, 0)'
                }], false)
            }
        },
        lineStyle: {
            normal: {
                color: '#C25353',
                width: 1
            }
        }
    },{
        type: 'bar',
        itemStyle: {
            color: 'transparent'
        },
        data: data.map(function(d) {
            return d[0];
        }),
        coordinateSystem: 'polar',
        stack: '最大最小值',
        silent: true
    }, {
        type: 'bar',
        itemStyle: {
            borderWidth: 10,
            color: echarts.color.lerp(0.5, ["green","red"])
        },
        data: data.map(function(d) {
            return d[1] - d[0];
        }),
        coordinateSystem: 'polar',
        name: '价格范围',
        stack: '最大最小值'
    }, {
        type: 'bar',
        itemStyle: {
            color: 'transparent'
        },
        data: data.map(function(d) {
            return d[2] - barHeight;
        }),
        coordinateSystem: 'polar',
        stack: '均值',
        silent: true,
        z: 10
    }, {
        type: 'bar',
        data: data.map(function(d) {
            return barHeight * 2;
        }),
        coordinateSystem: 'polar',
        name: '均值',
        stack: '均值',
        barGap: '-100%',
        barCategoryGap: "1px",
        z: 10
    }]
};